IT is D, look this scenario:
Sending copies (bcc) of messages to other recipients. For example, you could copy messages with critical DLP violations to a compliance officer's mailbox for examination.
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Not A, Not B, Because not mentioned about "send a copy of message"
Not B, Although you guys mentioned about the below secondary action in your comments, But in the second option (B) there is not any sign of a copy of message
(((Secondary actions include:
Sending a copy to a policy quarantine if you choose to deliver the message. The copy is a perfect clone of the original, including the Message ID. Quarantining a copy allows you to test the DLP system before deployment in addition to providing another way to monitor DLP violations. When you release the copy from the quarantine, the appliance delivers the copy to the recipient, who will have already received the original message.)))